Adjustable roof for furnaces



July 15, 1930. A. REPPMAN 1,770,806

ADJUSTABLE ROOF FOR FURNACES Filed May 7, 1928 2 Sheets-Sheet 1 fly! I 6 I ll :4 t I a Z 6, 6 m

o o X a C 7 a 0 6 I a O I II I o E I r 1 I 1 w 6 E A. REPPMAN 7 ,306

July 15, 1930.

ADJUSTABLE ROOF EOR FURNACES Filed May 7, 1928 2 Sheets-Sheet a w 6 m J l 5 o Ziufi0fi Patented duty 15, 193i) Mme ALBEnrnnrPMAn; or LONDON, ENGLAND ADJUSTABL noon sonrunnncns Application filed my 7, 1928, Serial No. 275,832, and in Great B'rit'ainMarch 5, 192a This invention relates to roofs for boiler and other furnaces of the kind in which the roof is formed of suspended elements adjustable for wear and to meet varying combustion requirements, the object of the present invention being to provide an improved construction and arrangement of suspended furnace roof which permits of easy adjustment without rebuilding and whilst the furnace is in operation and ensures that in'all adjustments of contour an unbroken internal surface is maintained in the furnace roof.

According to the invention a roof for fur naces and the like having means for varying the internal contour and heightris provided wherein the roof is constructed in a plurality of sections so interconnected that adjustment in the position of one section automatically causes the adjacent section or sections to be correspondingly adjusted for the purpose of ensuring the preservation of an unbroken surface in the furnace roof irrespective of changes in contoun According to the preferred form of carrying the invention into effect the roof sections are provided with a number of upwardly extending webs or flanges which are linked to the supporting members and which enable the adjacent sections to be linked or pivotally connected together. I 7 7 Reference will now be made to the accompanying drawings which illustrate by way of example constructions according to the invention in which Figure 1 is a longitudinal section through the roof of a water tube boiler furnace,

Figure 2 is a partial cross sectional elevation through the furnace shown in Figure 1,

Figure 5 is a longitudinal sectional elevation of an alternative form of construction,

and

Figure 4 is a partial cross sectional elevation at the furnace roof shown in Figure 3.

Referring first to Figures 1 and 2, the adjustable furnace roof illustrated comprises two adjustable sections a and b, the formerbeing disposed adjacent the entranceto the furnace, whilst the latter is disposed in-a succeeding position and terminates inan upwardly curved inner end 0 whichin its .of suspension are shown in Figure 1'.

uppermost position as shown abuts against a bridge (5 over which thegases of combustion pass to the boiler tubes 6. Each-of the roof sections comprises a series of refractory blocks which are formed on their upperlsurfaces or edges with dove-tail shaped slots (seeFigure 2) which are engaged by metal hanger bars 9 also of dove-tail cross section,

a number of which extend longitudinally of each of the furnace-sections a and b. The bars 9 are formed integral with or have secured thereto a number of upwardly extending webs flanges or lugs h, i, j, and k, which serve in the first-place for the suspension of the roof sections from a number of transverse beams Z, mand "/1 carried adjustably on steel bearers or cleats 0 of the furnace supported by the fabric steelworlr. These beams are preferably supported by screw jack or adjustable devices 79 as shown in Figure 2 wnich enable them to be adjusted in height from the exterior of the furnace without the necessity of dismantling or rebuilding. Two methods forward end of the roof section a is sus pended from beam Z formedby assemblingtwo channel-shaped elements with a space hetweenithem, through which space passes a series of bolts ggthe lower ends of which are provided with enlargements T which are slot-. ted and secured to the flanges h of the hanger bars 9 by nuts and bolts 8. The upperends of "the bolts 'g' pass through flanged plates .21, above which are secured loch nuts a which permits; certain degree of adjustment in the assembly of the flanges 72/ to thebeain. The flanges 2' of the hangerbars g are connected to the flanges y' of the hanger bars 9 on the adjacent roof section 7) by links '0, the disposition of which is such as to permit movement of the section 7) towards or'away from the section a without altering the pivotal height of the lattenalthough any alteration in the vertical height'of the forward end of section 7) will be automatically transferred through the links "v to the section a and thus preserve" an unbroken internal roof surface irrespective of changes in contour SHCllxfiS are indicated by the brokenlines in Figure 1 which maybe effected by lifting or lowering The the transverse supporting beam The, mid portion of the roof section b is connected by links 'tL to members 50 which bridge the space between the internal lower flanges of the pair of beams m whilst each flange 1 a of the hanger bars 9 at the rear end of the roof section Z) is connected to the beam n by means similar to tuose already described in connection with the beam Z. Thus, any ustment in the vertical height of the beam n causes the roof sect-ion to pivot-around its point of suspension from toe beam m to alter the angle at a point remote f n the pivot axis.

In the modified form of construction illus trated in Figures 3 and 4} the same letters of reiereuce todenoteparts corresponding to parts in Figures 1 and :2. In this con struction, however, suspension ofthe roof scctio isentlrely by means of bolts and the adjustment in height of the supporting beam u is effected :by a worm and worm wheel ar-' rangcment 1 which rotates .a screw-threaded s1 indie carrying a sleeve by which vertical i'n'ovonient is imparted to the supporting beam. in Figure 3 two alternative contours which maybe obtained in the furru ce roof by adjusting the positions of the sup porting beam are indicated in broken lines. In building the furnace with a roof formed accor ing to the invention spaces 2 are provided in the side walls to receive afilling or plugging if the roof be raised. If the roof be lowered the filling-in material is removed, but the roof should not be dropped direct on the offset bricks in the wall since space must be provided for expansion. Usually a making-up brick 3 is provided, as shown in dotted lines Figure 2.

I claim j 1. A roof for furnaces composed of se riall-y and link-connected arch sections, and adjustable supports for the sections disposed to permit said sections to be supported at,

various angles to each other and to maintain a continuity of the inner faces of the sec tions.

2. The combination with a furnace having transverse supports, of a roof therefor comprising a pluraiity of sections, each section comprising a plurality of refractory blocks, and metallic hanger bars, means including; links connecting hanger bars of adjacent sec-- tions together, and adjustable support ng means for the sections connected to the trans verse supports and thehanger bars.

The combination with a furnace having transverse supports, of a roof therefor comprising a plurality of sections, each section including a plurality of hanger bars and refractory blocks supported on said bars, said bars being provided with apertured lugs upon their sides opposite to the blocks, link means connecting the lugs of the adjacent rods pivotally connected to the remainsaid sections adjacent the adjoining ends of the iatteiyvertically adjustable means an;

porting the hanger bars of each of said sections adjacent their other ends from one of said supports. and means supportin the hanger'bars of one of said sections between their ends for rocking movement on a liori- Zontal axis.

5. A roof for furnaces or the like accord ing to claim 4 wherein .the means which supports the hanger bars of one of the sections between the ends of the latter comprises links depending fromone of the supports and vertically djusta is toward and away from the latter.

In witness whereof I affix my signature.

ALBE {T REPPMAN. 

